# 成员运算符  in      not in
word = 'asdfgghj'
x = input('enter a char: ')
for c in word:
    if x == c:
        print('exist')
        break
else:
    print('not exist')

if word.find(x) != -1:
    print('exist')
else:
    print('not exist')

if x not in word:
    print('not exist')
else:
    print('exist')
